Synthesis, Properties And Characterization Of Novel Heat-Resistant Material Polyarylene Sulfide Sulfone Imide

A new monomer (Dichlorodiimide) was synthesized by the reaction of 4,4/-Diaminodiphenyl sulfone with 4-Chlorophthalic anhydride in the presence of acetic anhydride and triethylamine in acetone solvent. Polymerizations of the monomers dichlorodiimide and sodium sulfide were carried out under high temperature (200 ℃) with N-methyl-2-pyrrolidinone (NMP) as solvent. The method of synthesis monomer and polymer were investigated. We have prepared the polymer with the viscosity of 0.231dl/g, and the chain and aggregative structure of PASSI were characterized by FT-IR spectrum, Raman spectrum, H-NMR spectrum, wide-angle X-ray diffraction spectrum. Physical properties of the polymer, including thermal stability and solubility, were also studied. DSC and TG analyses revealed the glass transition temperature Tg =252.4 ℃and that the thermal decomposition temperature Td =484.9 ℃. The polymer possesses excellent thermal properties and is a novel heat-resistant material. The solubility parameter of polymer has been calculated and applied in solubility experimentation. The preparation of an organic material with high thermal stability has been a goal of research in polymer chemistry for several decades. Polyarylene sulfides (PAS) are one of the most promising high performance polymer and the most typical polymer is the polyphenylene sulfide (PPS). PPS has been widely used owing to its excellent chemical resistance and physical properties. However, PPS possess of disadvantages such as imperfect tenacity and limited thermal stability virtually. Those undesired properties limit wider application of the polymer. To overcome those drawbacks and enhance the thermal properties of the PPS, various modifications of the polymer structure were applied, including the introduction of appropriate conjugate substituents into the polymer backbone, during which a monomer containing a ring of imides was firstly synthesized and then imide ring was introduced into PAS backbone to give a novel thermoplastic material with improved heat-resistance. The monomer synthesis was associated with an imidized process. The most common technique for the preparation of typical polymers containing imides ring such as polyimides has two-steps. The first one is to synthesize the precursor amic acid; The second one is to achieve the fully imidized structure via thermal dehydration. However, during thermal imidization, some side reactions such as dissociation may also occur, The published data indicated that only a 50-85% cyclization was achieved in the imidization reaction due to bound solvent residues . There are certain problems connected with the instability of amic acid residual, such as completeness of imidization, elimination of released water, and formation of microvoids in the final polymer materials resulting in inferior mechanical properties. For overcoming these problems, the monomer was processed firstly in the form of the amic acid and then fully chemical imidization in this paper.